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FranAccording to some definitions an icosahedron is considered a Platonic solid so that each of its faces is an equilateral triangle. You would, therefore need three coplanar isosceles triangles to make each face of the icosahedron. Since there are 20 faces in an icosahedron, you would need 60 such triangles.
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It's possible to build two triangles with all the same angles that are not congruent?
True
How many lengths of straw would be needed to build a pentagonal based pyramid?
5
If you have 6 identical matches and you have to build 4 identical triangles The length of any triangle side must be equal to 1 match How would you do it?
You've got to build a 3 dimensional triangle. Lay the first three matches flat on the table touching one another in the shape of a triangle, then put the remaining three matches at each of the corners of the original three matches so that the second set of three meet together at the apex above the original three matches. Visually, it would take the shape of a pyramid. That will give you four equal triangles.
How was an inclined plane used to build the pyramids?
It was used by pushing the blocks up to the spot they needed. It helped make it easier then carrying it to the top
How many acres needed to build an airstrip?
well I would say at least 20 at least,and it needs to be reasonably flat but it really depends on the sort of plane you are flying.
